Dyfyniad APA

Gabler, R. E., & Robert E. Gabler. (2007). IE Ess Phys Geo-Physgnow 8e. CA: Cengage Learning, Inc.

Dyfyniad Arddull Chicago

Gabler, Robert E., và Robert E. Gabler. IE Ess Phys Geo-Physgnow 8e. CA: Cengage Learning, Inc, 2007.

Dyfyniad MLA

Gabler, Robert E., và Robert E. Gabler. IE Ess Phys Geo-Physgnow 8e. CA: Cengage Learning, Inc, 2007.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.